| 摘要 |
<p>PROBLEM TO BE SOLVED: To display a continuous track, and to instantly switch the track length. SOLUTION: When renewing track data by coupling track data on a memory to the newest echo data by gradually changing the track data, continuous track preserving processing to be preserved in a specific value is executed on data approaching up to the inside of a prescribed range to a color and luminance of an image screen background and a data value for indicating the same color and luminance according to repetition of subtraction. When converting the track data on this memory into an RGB code according to pallet information, the continuous track can be displayed by using the pallet information for associating the RGB code related to the color and the luminance different from those of the image screen background with the specific value. The track length is instantly switched by switching of the pallet information.</p> |
